In other words, 18,000 is 1,200 times the count of Living Kings and Queens, and the count of Living Kings and Queens is 0.00083 times that amount.

(2015 figures) (distinct Monarchs)As of 2015, the world has fifteen Kings and Queens reigning over 45 countries. Of all these, Queen Elizabeth the II is the only reigning Queen; she has monarchical authority over the sixteen of the Commonwealth nations.

In other words, the count of Countries in Africa is 0.003 times 18,000.

(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.